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Re: How accurate are the MSD RPM Chips. PostSat Oct 03, 2009 1:06 pm. Funny you guys mention this..... I bought a 7al3 at the beginning of the year. After I hooked it all up I went throught all the rpm switches and put the test 3000 chip in it and went right to 3000 on all 4-5 rpms ports.
3. Restart the engine and check if the idle RPM has dropped. If there's no change in the idle speed, the solenoid has a problem. 4. Use an ohm meter to check the solenoid by attaching the positive lead to the VPWR (vehicle power pin) and the negative lead to the IAC pin.1  Your resistance reading should be between 7.0 ohms and 13.0 ohms.. Use a test light if the idle speed did not do what it was supposed to. Hook it up to the idle air control solenoid and watch the light. 1  The light will either flash or become dimmer for the four circuits if the valve is at fault.